on smoothed plateaux of rock, the place thus acquiring from nature all the benefit of a paved courtyard, as well as of a perfectly firm and dry foundation. Often you can trace in these natural pavements the primitive channellings and striæ, though hob-nails and wagon-wheels have clattered over them for centuries. The matter massed up against the smoothed valley-sides has all the appearance of that of _moraines_ amongst the Alps. A moraine, as must be known by many persons, is the accumulation of loose matter which a glacier brings down in its course, and deposits at its base. The matter seen here, as at the skirts of the Alpine glaciers, is a coarse, pale, sandy clay, mixed with rough stones of all sizes up to many tons--mixed confusedly--with here and there little nests of matter, where the clay and sand have been separated and laid down by water. Over this matter in some places are stratified sand and gravel, coming to flat, terraced forms, like sea-beaches. These, however, are rare objects. The tendency of the whole appearances, in an unprejudiced mind, is to convey the idea that ice has been the cause of the main phenomena. That water in any form could have produced them is utterly inadmissible, though this was the supposition formed by the first scientific observer, M. Sefstrom. Persons who have only read descriptions of the appearances may think them explainable upon an aqueous theory; but if they visit Sweden, and look at the surface with their own eyes, they must, if open to conviction at all, see that no such agent could have produced such effects. Only some agent applying forcibly, pressingly, and with an equable, continuous motion--like a plane going over a deal, or a plough in a furrow--could have so dressed the original surface. Such an agent is ICE. The identity of the loose matter with the moraines of existing glaciers points to the same conclusion. I therefore believe, with M. Agassiz and others, that ice has been the means of smoothing the surface of Sweden--ice on a scale of grandeur beyond what we are accustomed to see; though how such a glacial sheet was originated, and how it could move across the whole irregular face of a large country, up hill and down hill, maintaining over wide provinces one direction, I think it would be difficult to explain. We perceive clearly the nature of the agent, and we see this agent still at work upon the earth, though in a limited manner: the only difficulty is as to the different physical circumstances on which depended the magnitude of the phenomenon and the manner of its application. The superficial arrangements of the loose matter speak of a subsequent dip under water, a fact of which I shall have occasion to show other evidences.